FreeLists / si-list / [SI-LIST] Re: CPW Board Launch

[Ed Sayre III <esayre3@xxxxxxxx>]

Mark,
   Most PCB edge launch SMA's do not currently have the bandwidth to 
support a 70GHz bandwidth.  If you are truly serious, you will need to 
utilize a tool like CST or Ansoft to fully model the SMA-PCB-trace 
interface.  This is non-trivial, it is not for the faint of heart.  You are 
asking for a design that only a few people in the world can do.  This is 
not something that "rules-of-thumb" can answer.   You need expert help, or 
the equivalent of your own time to learn the tools and how to deal with the 
tool errors that will be evident at these frequencies.  Lastly, what tool 
would you use to measure something at 70GHz bandwidth?  This again is non 
trivial, the fixturing required to have a 70G bandwidth is very select or 
totally custom.

Hope this doesn't scare you away.

Regards
-Ed Sayre






At 10:54 AM 10/6/2004 -0500, Moeller, Merrick wrote:
>Experts,
>         I am looking for information regarding the design
>of a CPW launch for an edgemount coax connector. What
>are the best available resources for the design of CPW
>structures for testing, or otherwise?
>         What are some of the considerations in the
>design of a CPW? Do's and Don'ts would be good. I would
>like to support frequencies up to 70GHz.
>Regards,
>Merrick M. Moeller
>
>
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               NORTH EAST SYSTEMS ASSOCIATES, INC
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                         "High Performance Engineering & Design"
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  Dr. Edward Sayre 3rd            e-mail: esayre3@xxxxxxxx
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